larson



a Sheets-Shet 1.

(No Model.)

O.G. LARSON. SUPPORT FOR MANDREL BARS 0F TUBE ROLLING MILLS.

No. 528,676. Patented Nov. 6, 1894.

' 3 Speak-Sheet 2.

(Nb ModeL) 0-. e. LARSON. SUPPORT FOR MANDREL BARS 0F TUBE ROLLING MILLS. -No."5-2 8;,676.

N Patent ed Nov. 6, 18 94.

3 Sheets-Sheet 3.

i No Mode 1.9

R 0 G LARSON SUPPORT FOR MANDREL BARS OF-TUBE ROLLING MILLS.

,6'76. Patented Nov. 6, 18914.

I NC; 528

[Ya/aid? of JV wim i- Ultra Arns CARL GUSTAF LARSON, or SANDVIKEN, sweeten."

EPECIFICATION forming part of Letters Patent No. 528,676,dated November 6, 1894;.

Application filed Mey16,1894- serial No. 511,400. (No model.)

' Bars of Tube-Rolling Mills, of which the following is a specification.

My invention relates to means for supporting and bracing the mandrel-bars used in tube rolling mills. Such bars, as is well known, are, used to carry the mandrels and keep them in place between the rolls. When the arrangement is such that the mandrel-bar is subjected, in rolling the tube, to an endwise crushing strain,- there is'a tendency for the bar to bend or buckle, and this is especially the case where the bar is long and slender. To support and brace the mandrel-bar and enable it to resist the strains tending to buckle or bend it, is the object of my present invention, and an embodiment of the means employed therefor is illustrated in the accompanying drawings.

Figure 1 is a plan of a tube rolling mill pro.- vided with my improvements. Fig. 2,is a vertical, longitudinal section of the same taken in the plane indicated by line 2, 2, in Fig. 1. Fig. 3 is a rear, end elevation of the same. Fig. 4: is a view identical with Fig. 2 but showing the supports for the mandrel-bars in the position they assume when there is a tube passing them on the mandrel-bar. Fig. 5

. shows one of the lower supports in section and in front elevation, detached and on a larger scale. I

The tube rolling mill illustrated herein and provided with my improvement, is not in itself new herein, but will be briefly described. In a strong frame A, are mounted the many-grooved rolls, B.

D is at mandrel and E the bar thereof. At its rear end the mandrel-bar is provided with a handle, F, for manipulating it. The bar rests at its rear end upona ledge on the frame A.

In Fig. 4, X represents a tube on the man-f drel-bar F.

I will now describe the means for supporting and bracing the ma drel-bars.

Below the plane of the bars are arranged at suitable intervals three transversely extending shaftsior stout cylindrical bars, a, which carry the lower supports,

of these supports 2), one corresponding to each groove in the rolls. Each support b is in the nature of an eccentrically mounted, rocking sector or cam, grooved to receive the mandrel bar and tube, and over-weighted'at one side so as to assume by gravity the position seen in Fig. 2. One of, these supports 1) is seen detached in section a nd front elevation in Fig. 5. In' Fig: 1 only a few of the supports and mandrel-bars are represented. The upper supports are similar to those below in principle of operation, but as there is only one set of them,adapted to be shifted laterally,l

have found it more convenient to give them the form of wheels. These upper supports, 0, c, 0 arranged one over each of the shafts a, are mounted rotatively on shafts in a frame, 11, composed in the main of two side plates connected together by ties. Each ofthe supports 0' and c, has a flat-faced rim and on this rim a projecting weight, 0 which engages a. tie, d", in the frame d (see Fig. 2)

b, for the mand-relbars. There will be, on each shaft to, a series and limits the rocking movement of the support. the tie, 01*, as in Fig. 2, a progecting toe, g, one on the rim of each support a and 0 When the detent weight 0*, rests on will be directlt beneath the center of the rocking support and will impinge on the crown of the mand rel-bar E. The support 0, is provided also with'a toe 9, but this support is represented as mounted somewhat differently from the others. It has bearings in arms mounted pivotally in the frame (1. llowever,

the object in representing the three supports '0, c, '0 as different, is mainly to illustrate several modified forms. They might all be substantially alike, and they need only be sectors, not complete wheels.

It will be seen that when the parts are in the normal position seen in Fig. 2, there be-,

ing no tube on the mandrel-bar, the said bar will be braced'and supported from below and laterally by the grooved lower su pports b, and will be held dowu'from aboveby the impingement on it of the "toes g on the upper suptoo ports. in the lower supports rise up to or above the level of the axis of the mandrel-bar, and the toe g on the upper supports extend down to and rest on the crown of said bar. Thus the supports sustain and brace the bar against leaving the tube on the bar free to be removed.

mally embraces the lower half of (see Fig. 4)

touch the crown of the tube, and as these rims The shaft or bar, 0 on which theintermediate support 0 is rotatively mounted, extends across the machine frame and forms a guide ahd support for the frame d to move on. The shifting mechanism employed for moving the frame dand the supports is best illustrated in Figsil and Over sprocket .sheaves', h, h", are passed two chains, 1', which embrace the machine frame transversely and are secured to the frame d. The sheaves h are fixed on a shaft; h, rotatively mounted in the bed and geared with a crank or pilctwheel, j. By means of this wheel the frame (I may be conveniently shifted.

Operation: When the tube X is passed through the rolls and over a mandrel and its' bar, thejadvancingend of the tube strikes the parts of the supports which impinge on the mandrel-bar and thus rock said supports in a manner to open a passage for the tube between the upper and lower supports, each pair being thus, reached in succession and rocked. When the upper supports are rocked the flat rims thereof will just are not grooved the upper supports may now be shifted laterally to the next adjacent mandrel-bar and the operation of passing a tube repeated. After the tube is removed and out of contact with the upper end and lower supports,these supports return to their normal positions by gravity. There may be stop-bars, 75, in the frame to limit the movements of the lower supports b.

Fig. 5 shows clearly the groove, 1)", in the lower support I), and the collar, b', yvhioh northe mandrel bar. The end of the advancing tube X strikes this shoulder and rocks the lower support. The tube strikes the toe g, on the upper support and rocks it.

I have shown the mandrel-bar supported at three points in its length, but the number of points of support will be dependent on its length and diameter. The shifting of the upper supports after each tube is rolled leaves the last rolled tube free to be removed without hinderance from said supports.

I do not wish to limit myself as to the particular form of the several supports for the mandrel'bar as their forms may be varied. The main purpose is to provide supports and The checks at the sides of the grooves braces for the mandrel-bar at proper points and of such a character that they will yield to, and afford a free passage for the tube.

Having thus described my in vention', I claim- 1. In a tube rolling mill, the combination with the rolls, mandrels and mandrel-bars, of rocking supports under said bars, a series of upper rocking supports arranged in line lengthwise of the mill, a frame in which these upper supports are mounted and means for shifting said frame and supports laterally,

whereby they may be brought in succession: over the mandrel-bars, substantially as set forth. v

2. In a tube rolling mill, the combination with the rolls, mandrels and mandrel-bars, of thc grooved, rocking supports arranged beneath the mandrel-bars and adapted to embrace said bars beneath and at the sides, and

laterally movable rocking supports arranged over the said bars and adapted to bear on the same'normally, said upper and lower supports having weights to keep them in operative position and projections ii: the path of the tube whereby the latter displaces the supports as it passes over the mandrel-bar.

3. In a tube rolling mill, the combination with the rolls, mandrels and mandrel-bars- .and lower, rocking supports therefor, of the upper rocking supports mounted in a frame, and the means for shifting said frame laterally, said means comprising two endless chains embracing the machine and coupled.

to the support carrying frame, sheaves on which said chains are mounted, a shaft on which the driving sheaves are secured, and a crank for rotating said shaft.

4. In a tube rolling mill, the combination with the rolls, mandrels and mandrel-bars, of

the rocking uppersupports having projec- 'tions 0", to limit their rotation plain faces adapted to bear on the tubes, and projecting toes g, to bear on the crown of the mandrelbar, said toes being in the path of the tube passing over the mandrel-bar, lower supports for said bars.

5. In a tube rolling mill, the combination with the rolls mandrels and mandrel-bars, of upper rocking supports for the bars, and rocking gravity lower supports 12, each having a. grooved portion to receive and support the tube and a collar 1), arranged in thopath of a tube passing over the mandrel-bar and having a groove to receive and support the said mandrel-bar, as set forth,

6. The combination with the grooved rolls, mandrels and mandrel-bars, of rocking supports arranged under said bars, and laterally movable rocking, supports arranged over said bars, substantially as set forth.

7. The combination with the rolls, of a mandrel and a mandrel-bar, and a rocking support for said mandrel-bar, said support hav-' ing a projecting grooved collar adapted to receive and support the mandrel-bar and arand rocking ranged in -the path of and adapted to be en- In witness whereof I have hereunto signed gaged by the tube passing over the mandrelmy name in the presence of two subscribing bar, whereby thesupport is'rocked, said supwitnesses.

; port being also provided with a portion hav CARL GUSTAF,

' -5 ing a groove of larger diameter adapted. to Witnesses:

take under and support-the tube when the ERNST SVAJGwsT,

support isrocked, substantially as set forth. I v CARL TH. LUNfiHOLM. 

